Bolster-plate



(No Model.)

D. B. OLIVER.

BOLSTER PLATE.

Patented Nov. 29, 1892.

UNITED STATES PATENT OEEicE.

DAVID B. OLIVER, OF ALLEGHENY, PENNSYLVANIA.

BoLs'TER-PLATE.

SPECIFICATION forming' part Of Letters Patent NO. 486,890, dated November 29, 1892.

Application tiled March 21, 1892. Serial No. 425,677. (No model.)

To a/ZZ whom it may concern.-

Be it known that I, DAVID B. OLIVER, a resident of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Bolster-Plates; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to bolster-platesl for wagons, its object being to provide an efflcient form of bolster-plates which can be formed of wrought metal, either iron or steel, and in which a bearing of sufficient length for properly swiveling the two plates and supporting the king-bolt can be obtained without entering to any great extent into either the bench or bolster, and which will at the same time prevent the wearing and cutting into the bolster-pin or king-bolt, as the 0rdinary bolster-plates are liable to do, on account of their small bearing on the kin g-bolt, these bolts being in somecases worn entirely through.

In bolster-plates embodying my invention the bottom plate has a reinforcing-ring depending below the same around the bolt-hole, and an upwardly-proj ecting annular bearing rising from the plate around the bolthole, and the top plate has an annular cu`p, corresponding in shape to such bearing, fitting around and extending over the top of the bearin g, so that its inner edge will bear against the king-bolt, a long bearing between the parts being thus obtained for the length of an annular ring depending below the bottom of the lower plate and the upwardly-projecting bearing above the top surface of the same, While as the edge of the annular cup or seat of the top plate bears against the king-bolt a still further bearing, metal to metal, is obtained and the liability of wear of the bolsterplate into the king-bolt or of the king-bolt into the wood of either the bench or bolster is overcome.

My invention also embodies certain other improvements in bolster-plates, as will be hereinafter more particularly described.

To enable others skilled in the art to make and use my invention, I will describe the same more fully, referring to the accompanying drawings, in which- Figure l is a longitudinal section of part of the bench and bolster, showing the kingbolt and bolster-plates in position. Fig. 2 is a vertical section on the line 2 2, Fig. l. Fig. 3 is a perspective View of the bottom bolsterplate. Fig. 4 is an edge view of the same, and Fig. 5 is a bottom perspective of the upper bolster-plate;` Fig. 6, a top view of the same, and Fig. 7 an edge view of the upper bolster-plate.

sary that the bodies thereof be made of asingle or integral piece of metal to enable them to sustain the constant jar and vibration to which the wagon is subjected and the strains incident thereto. By my invention the parts which are required to bear such strain are materially increased in length of bearing or contact without weakening either the bench or bolster to any appreciable extent. The bottom bolster-plate (illustrated inthe sectional views and more particularly in Figs. 3 and 4) is formed of a flat plate a, corresponding to the upper flat surface of the bolster b and being secured thereto in any suitable way. Extending up in the center of said plate and around the bolt-hole d for the passage of the king-bolt e is the annular projecting bearing c, which, as shown in the drawings, is preferably slightly curved at the base and at the topcedge, so that while forminga proper bearing for the annular cup or seat of the top plate it will not cut or wear into the same. The bottom plate a has also the reinforcingring f depending from the bottom face thereof around the bolt-hole d, which reinforcing-ring f extends into the body'of the bolster and so, in the first place, extends the length of the bearing for the king-bolt in the bottom-plate, i

IOO

top bolster-plate gis preferably formed of the same width asthe bottom plate,but generally made to extend out beyond the same, as illustrated in the drawings. In the central part of such plate is the annular cup h, which extends up from the plate and the inner face of which forms the seat for the entrance of lthe bearing c on the bottom plate, saidinner face corresponding in shape to said bearing, so as to properly swivel the top plate upon the bottom plate, while said cup is provided with the inwardly-extending lip k, which extends inwardly over the top edge of the bearing c, so that the inner edge of said lip may bear upon the king-bolt. In addition to thus forming a strong swiveling connection between the two bolster-plates, and one which has a bearing for the full length of the surface of the upwardlyprojecting bearing c of the bottom plate and over the top of the same, the annular cup h by extending into the body of the bench m also increases the hold of said plate upon the bench and assists the screws or bolts in bearing the strain. While in this way the top and bottom bolster-plates both take into the wood of the bench and bolster, respectively, sufficiently to obtain a hold thereon and relieve the bolts and screws of such heavy strain, they do not extend into the wood to such extent as to weaken either the bench or bolster, but, rather, by forming such projections in line with the bolt-holes through the bench andbolster, increase the strength thereof and prevent the king-bolt from wearing so easily into the bodies thereof.

rIhe two bolster-plates may be formed in any suitable way either by rolling and forging or stamping, as it may be found desirable. It is the intention to cover the preferred method of forming the same in a separate application. The bolster-plates are connected to the bench and bolster in a suitable way, the cup h of the top plate fitting around the lower end of the bolt-hole in the bench and the reinforcing-ring f of the bottom plate litting in like manner around the upper end of the bolster-hole in the bolster. When Vthe bench is placed upon the bolster, the parts are brought into proper line by the annular cup h, fitting around the bearing c, and the king-bolt is then passed through the same, and, if necessary, secured to a nut at the lower end. When in use, as the two plates are held in line by the cup h, fitting over the bearing c, which provide long surfaces for sustaining the strain, and consequently reduce wear of the parts, and, in addition to that, the lip lo of the cup extends over and bears upon the king-bolt, a strong and proper swiveling of the parts is obtained, and the liability of cutting into the king-bolt by wearing action of a short hearing at a particular point is overcome. As the parts of both the top and bottom plates bear on the king-bolt,

so as to receive the pressure thereof, the great liability of wear incident to throwing the lking-bolt against the bearing of the bottom plate is overcome by the annular lip of the cup bearing on the top plate, which prevents such wear as would permit movement in that direction of the pin. The bolster-plates are therefore much more durable and prevent the vibrating or shaking movement of the parts incident to rapidv wear.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In bolster-plates for wagons, the combination of a bottom plate having a reinforcing-ring depending below the same around the bolt-hole and an upwardly-projecting annular bearing around the bolt-hole and a top plate having an annular cup or seat fitting around and a lip extending over the top of said bearing on the bottom plate, substantially as and for the purposes set forth.

2. In bolster-plates for wagons, formed. of

two plates swiveling on each other, the bottom v plate thereof having a reinforcing-ring depending below the same around the bolt-hole, substantially as and for the purposes set forth. In testimony whereof I, the said DAVIDB. OLIVER, have hereunto set my hand.

l DAVID B. OLIVER. Witnesses:

J. N. COOKE, F. G. KAY. 

